Picture frame



FIG. 1 is a front, top, right perspective view of a picture frame showing our design;

FIG. 2 is a back, top, left perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

CLAIM The ornamental design for a picture frame, as shown and described. 